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Old 09-22-2009, 03:03 PM   #3
cyberpine
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Join Date: Jul 2009
Location: Miami, FL
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Re: Offset/Backspace on OEM 15x8 Rally Steel rims from my 87 C10?

Quote:
Originally Posted by flamingbig10 View Post
should be 4" of bs
Thanks.

so If I apply this formula

Back Space to offset conversion:
take overall rim width including outer lip (usually listed rim width + 1"), then divide by 2, then subtract that number from the measured backspace, then convert that number to metric by multiplying by 25.4.

4 - (8+1)/2) * 25.4 = -12.7mm offset .. could that be right?

So, if a 15x10 rim is offered in backspaces 2,3 and 4 and I wanted the rim to sit out further .. would I go with with a 2 inch backspace

(2 - (10+1)/2 )* 25.4 = -88.9mm offset... something sounds wrong with that .. or maybe a 15x10 with 2" inch backspace would just be crazy .. I have read that it's offered somewhere.

(4 - (10+1)/2 )* 25.4 = -38.1mm (which sounds right)

This is the rim I'm looking at:

Cragar 365 V-5 -44mm offset

Can somebody tell me what the backspace on this rim would be?

I'm hoping it will stick out just a tiny bit out of the wheelwell.

Thanks.
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Last edited by cyberpine; 09-22-2009 at 03:05 PM.
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